The tags below represent information which has been observed in the Real
Metadata format, but ExifTool will extract any information it finds in this
format. (As far as I can tell from the referenced documentation, string
values should be plain text, but this is not the case for the only sample
file I have been able to obtain containing this information. These tags
could also be split into separate sub-directories, but this will wait until
I have better documentation or a more complete set of samples.)